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From "Felix Meschberger (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FELIX-3377) Allow a component to update its own service properties
Date Wed, 07 Mar 2012 19:26:59 GMT

    [ https://issues.apache.org/jira/browse/FELIX-3377?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13224627#comment-13224627
] 

Felix Meschberger commented on FELIX-3377:
------------------------------------------

This makes sense to me.

Some remarks:
(1) I would probably name the new package o.a.f.scr.component and export it with a mandatory
attribute (as we do with other provisional API we export)
(2) I would rather call the MutablePropertiesComponentContext interface ExtComponentContext
(3) The JavaDoc for the updateProperties method should clearly indicate (as you propose) that
the properties from the component descriptor are to be amended and/or updated and that these
properties are still subject to being overwritten by configuration from Configuration Admin.
This would imply that existing properties from the component descriptors cannot be removed,
right ?

Have you already submitted an OSGi bug proposing this enhancement in a future spec ?
                
> Allow a component to update its own service properties
> ------------------------------------------------------
>
>                 Key: FELIX-3377
>                 URL: https://issues.apache.org/jira/browse/FELIX-3377
>             Project: Felix
>          Issue Type: Improvement
>          Components: Declarative Services (SCR)
>    Affects Versions:  scr-1.6.0
>            Reporter: David Jencks
>         Attachments: FELIX-3377.diff
>
>
> If you just register a service in code, you can give the ServiceRegistration to the service
and it can update its service properties to reflect what it can discover about its environment.
 This proposes that services registered through DS should be able to do this too, by calling
an updateProperties(Dictionary) method on the ComponentContext.  (Since we'd need a spec update
to add the method to ComponentContext, I added a new interface that ComponentContextImpl implements).
> Right now a service could get Config Admin and modify the properties there, but then
(a) the update method is called even though the component itself initiated the changes and
(b) the new property values are persisted which is presumably not desired.
> According to the spec config admin properties override default property values specified
in the component xml.  I think that in order to reduce confusion, once a property has been
set through config admin it should not be possible to update it through this update method.
 This also makes implementing this idea easy.
> IIUC this idea does not make sense for component factories.

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